Aerial propeller.



L. T, ASSTT@ ERL PEPELLEB. Arrmoums FILED oo'r. 26, 1911.

' meme. De.3,1912.

Siwa/Wto@ mm T5@ we# @mmm Mouans y QFFCE.

. ftll'li YGRK, ASSIGNOR OF ONE-FOURTH T0 1. T DAK/ED A. OSBORN, BOTH OF NEWBURGH,

PRPELLER.

Patented Dee. 3, 1912,a nemer i911. serial No. 656,23?.

'formed of canvas or .other fabric or suitable ieziible material. Each of said blades or vanos is of oblong rectangular Contour and is attached at its Jfront and rear edges to the trent and rear folding rods orarins by which it is ,carried and supported, and at points intermediate of itsilength is secured along one of its broad sides to the remaining or intermediate arms of the series. By this construction and arrangement each flexible blade or vane when spread for action is ejifven a spiral curvature on an ar(- of .)Oo between its lead and trail edges. The blades are thus properly pitched for compressing the air and exerting a baokwa rd thrust thereon to secure a powerful traetiiveor pulling thrustupon the spiral banks of eom pressed air formed thereby, on which the blades er Yanes travel for a propulsive aetion. The front and rear folding or pivoted arms of the series are `eouililed by flexible stays or guys 14, whereby they are mutually held andreint'orced against lateral. displacement. while the front and rear rods of the series are connected by similar flexible stays i or guys 15, whereby they.' are i'mitually` held and reintoreed against undue forward motion under wind pressure when the propeller' in action'. To further reinforce the propeller structure flexible stays 'or guys 1G are provided and connect the rear folding; or piuoted arms of the series with a flange or collar l? on the shaft. It will be observed that by the described form and arrangement of the blades or Yanes a spare or opening is provided between their forward edges 'for the rr-iarward passage of the air between their compression surfaces, and proper elearance is afforded between such surfaces for lie rearward travel of the air without haekasli and with a minimum degreel of slip- *nagre Silben the propeller is out of action the, parts tliereotl are free to be folded reari .fardly and spirally' about. the shaft and scoured in :any suitable manner, so that. the 1l propeller may be' compactly packed for storor shipment. .Vlien the propeller'is set into action, the parts thereoi. are brown outward by centrifugal force and the blades or Yanes maintained in working positionby the pressure of the air, whereby maximum ellieieney is obtained. Owing to the described construction a propeller of light weight but of maximum Strength is'nro- 1 nin eurt'aee which I, lded vided and which is advantageous in aording a maximum spread or amount of propelling surface Within a minimum Working diameter.

It will, of course, be understood thatthe number of blades may be varied Within reasonable limits.

Having thus described the invention, what I claim as new is:

An aerial propeller comprising a'shaft, a plurality of longitudinal series of lateral arms fixed to and extending around the shaft, eaeh series of lateral arms being are .ranged spirally aboutI the shaft, a Collar upon the shaft in rear of said series of fixed arms, a corresponding number of series of folding arms pivoted tothe spirally arranged series of lixed arms to fold rearwardly in a plane parallel with and spirally about the shaft, flexible oblong rectangular blades secured to each series of pivoted arms, said blades being adapted to assume a spiral curvature when in working condition and the series of blades to form an air channel between the shaft and their compressi on surfaces, flexible stays connecting the front pivoted arms of the several series, flexible stays connecting the rear pi'voted arms of LINTON T. l`.-&SS.ETT. Witnesses:

C. C. HINES, BnNNF/rr S. Jozfns. 

